The main aim of the research: to offer analysis methods for development of a knowledge-based decision support system in the sphere of construction export. • To evaluate the effectiveness of construction export using methods of multiple criteria analysis. • To make use of expert methods when developing the system of feasibility study of construction export and the knowledge base of best experience. • To describe application of internet as a tool in analysis of foreign markets and provide offers to exporters of the Lithuanian construction branch on how to use Internet in their activities thus granting improvement of export effectiveness. • To provide offers on how to reduce export cost and improve effectiveness and quality by using the newest IT and knowledge systems.

Pasaulyje plačiai naudojamos kompozitinės plieno-betono konstrukcijos, o jų darbo ypatumai yra sudėtingi ir nėra iki galo ištirti. Baigiamajame magistro darbe nagrinėjama plieninio pluošto ir jungių, išdėstytų skirtingu atstumu, įtaka kompozitinių plieno-betono konstrukcijų mechaninėms savybėms. Siekiant nustatyti plieninių jungių ir metalinio pluošto įtaką kompozitinės sijos bendram darbui, bei betono mechaninėms savybėms, atlikti analitiniai skaičiavimai ir eksperimentinis tyrimas. Darbą sudaro trys dalys. Pirmoje dalyje aptariama tokių konstrukcijų darbo problematika. Antroje dalyje pristatomas eksperimentinis tyrimas, jo darbo eiga bei gauti rezultatai. Trečioje dalyje atliekami analitiniai skaičiavimai ir gauti rezultatai lyginami su eksperimentiniais. / In the world composite steel-concrete structures are widely used, and their features are complex and not fully investigated. At the final master work the steel fiber and connectors, placed in different distance, influence to composite steel-concrete structures mechanical properties are analized. To determine the steel joint and a steel-fiber influence to composite's overall work, and mechanical properties of concrete, was performed out analytical calculations and experimental. The work consists of three parts. The first part deals with the problems of construction work. The second part presents the experimental study, its process and the obtained results. The third part presents analytical calculations and obtained results are compared with experimental results.

Statybos verslas viena iš didžiausią pridedamąją verte turinčių verslo šakų. 2008 metais kilusi pasaulio ekonominė krizė pasireiškė bendrojo vidaus vartojimo produkto mažėjimu. Krizę sukėlė keletas priežasčių: ilgalaikių pokyčių naftos rinkos kainodaroje bei su ja susijusių sferų - benzino, maisto produktų kainodaroje, nekilnojamo turto bei vertybinių popierių rinkoje ir bankininkystės sektoriuje kilusių nesklandumų. Tai padarė didelę įtaka statybos verslui. Vienos statybos organizacijos bankrutavo, kitos buvo priverstos reorganizuotis. Šiame moksliniame darbe analizavome Dariaus Beconio įmonės ir UAB „Šiaulių plentas“ veiklą krizės metu. Apžvelgėme įmonių vadovų priimtus sprendimus ir pateikėme pasiūlymus įmonių veiklos optimizavimui. Didžiausią dėmesį skyrėme logistikos taikymui ir įmonių logistikos tobulinimo galimybėms. Mokslinė literatūra analizuota nuo 2009 metų, o empirinis tyrimas atliktas 2011 metų sausio mėnesį. / Construction business is one of the most added-value industries. In 2008 the world economic crisis has occurred and gross domestic product fall in consumption. The crisis caused a number of reasons: long-term changes in market pricing of oil and related spheres - petrol, food pricing, real estate, the stock market and banking sector problems encountered. This had a significant impact on the construction business. One building companys went bankrupt, while others have been forced to reorganize. This study analyzes the Dariaus Beconio company and „Šiaulių plentas“ company activities in times of crisis. We overviewed what business leaders have made decisions and proposals to optimize business performance. We have concentrated on the application of logistics and logistics business development opportunities. Scientific literature was analized since 2009, and the empirical study was conducted in January 2011.

The aim of this thesis was concentrated around the examination of the ergonomic aspect of working conditions provided to the engineers at the construction site, assessment of their quality of living, psychosocial factors influencing them and establishment of the impact of working conditions on the quality of life.The thesis is composed of the analytical and empiric parts. The analytical part examines the working conditions and the factors that influence the quality of life. The empiric part is based on the survey and contains the assessment of the ergonomic aspect of working conditions provided to the engineers at the construction site, their quality of life, health disorders and psychosocial factors.Conclusions and recommendations are made on the basis of the analysis of the research conducted in the spheres of ergonomics, safety and health.

Tiriamojo darbo pirmos dalies tema – „Besikeičiančios užsienio atstovybių veiklos ypatumų įtaka funkcinei sąrangai ir architektūrinei raiškai“. Didesnis dėmesys kreipiamas į konkretesnę pastatų paskirtį, į urbanistinį, politinį, ekonominį kontekstą ir darbinių erdvių formavimą. Pagrindiniai nagrinėjami pastatai- vyriausybinės ir kitos valstybinės institucijos, konkrečiai - ambasados. Ambasados- tai diplomatinės vienos valstybės atstovybės kitoje. Tokie pastatai dažnai turi ne vieną funkciją. Administracinė dalis, skirta tam tikriems darbuotojams, jungiama su visuomenei skirta, tam tikros valstybės kultūrą platinančia ar kita kultūrine veikla užsiimančia dalimi. / The choosen situation is in the center of Vilnius, near the old town. The function is double: embassy and social part.

There are many calculation methods for layered structures in scientific literature, but in most cases these calculation methods are complicated and inapplicable for layered structures made of reinforced concrete. Moreover, most of the calculation methods do not estimate the possibility of appearance of the cracks in the internal layers before the cracks in external layer in which the tensile stresses are higher. The internal layers could be made of lightweight concrete type materials (e.g. foamed concrete) which shrinkage deformations are several times higher if compared to the external layers. Therefore, the cracks in the internal layer may appear even before actual loading of the structure. The flexural layered members may have very complex state of stress and strain. Such state of stress and strain should be estimated when designing the effective and reliable building structures. The proposed method for the calculation of carrying capacity and cracking moment of the external layer of flexural layered reinforced concrete structures estimates the cracking of the internal layer, concrete shrinkage deformations and the physical and mechanical properties of used materials.

There are many calculation methods for layered structures in scientific literature, but in most cases these calculation methods are complicated and inapplicable for layered structures made of reinforced concrete. Moreover, most of the calculation methods do not estimate the possibility of appearance of the cracks in the internal layers before the cracks in external layer in which the tensile stresses are higher. The internal layers could be made of lightweight concrete type materials (e.g. foamed concrete) which shrinkage deformations are several times higher if compared to the external layers. Therefore, the cracks in the internal layer may appear even before actual loading of the structure. The flexural layered members may have very complex state of stress and strain. Such state of stress and strain should be estimated when designing the effective and reliable building structures. The proposed method for the calculation of carrying capacity and cracking moment of the external layer of flexural layered reinforced concrete structures estimates the cracking of the internal layer, concrete shrinkage deformations and the physical and mechanical properties of used materials.

Suspension bridges possess a number of advantages, allowing overlapping average and large spans. The basic disadvantage of suspension bridges can be considered their increased deformability, particularly under the action of non-symmetrical and local loads. Deformability depends, in general, on the kinematical character of displacements of a flexible suspension cable. Required rigidity of suspension bridges is achieved, by increasing the height, and consequently the weight of a stiffening girder, by diagonal suspenders or two-cable or combined prestressed systems. Reduction of kinematical displacements of the main cable can also be achieved by a reduction of the sag-to-span ratio, but the smaller the sag of a cable, the greater are the cable thrust forces and the required cross-sectional areas of the cables. One of the ways of suspension systems stabilization is giving certain bending stiffness to the suspension cables. Such structural solution with success is used in suspension roofs. With the aim to increase the stability of suspension bridges the author proposes to use the finite bending stiffness cables. The cables can be made of standard steel profiles or have composite sections. Conventionally, they are called as “rigid cables”. To verify this solution, the investigation on behavior of suspension bridges with rigid cables under loading has to be undertaken.

Baigiamojo darbo tikslas – gyvenamosios statybos pavyzdžiu matematiškai apibrėžti resursų poreikio piniginėmis lėšomis priklausomybę nuo statybos stadijos. Nagrinėjamas objektas – Vilniaus mieste pastatyti daugiabučiai namai nuo 2004 iki 2007 metų. Analizei yra paimta 16 daugiabučių namų finansinių grafikų duomenys. Resursų poreikio atskiriems statybos etapams analizė yra atliekama taikant regresinę analizę. Baigiamąjį darbą sudaro tokios dalys: lentelių sąrašas, paveikslų sąrašas, turinys, įvadas, resursų poreikio atskiriems statybos etapams atliktų tyrimų apžvalga, regresinė analizė, duomenys skaičiavimams, resursų poreikio atskiriems statybos etapams analizė, metodikos praktinio taikymo uždavinys, išvados, literatūros sąrašas, 9 priedai. Darbo apimtis – 65 psl., 26 paveikslai, 15 lentelių. / The objective of the final work is to identify resource needs in terms of money for separate building (private housing) stages. The object under the research is blocks of flats built in Vilnius during the period 2004 – 2007. Financial graphics data of 16 blocks of flats is analysed. Need of resources analysis for separate building stages is carried out by applying regressive analysis. The final work consists of list of tables, pictures, content, introduction, nedd of resources for separate building stages research review, regressive analysis, calculation for data, resource analysis, practical activities, conclusions, list of literature, 9 attachments. The amount of work is 65 pages, 26 pictures and 15 tables.

Pirmajame disertacijojos skyriuje analizuojama gyventi palanki būsto aplin-ka, „intelektinio būsto“, „sumanaus namo“ sampratos, nagrinėjamos intelektine gyventi palankia aplinka suinteresuotos grupės, esamos būsto problemos Lietu-voje ir užsienyje. Aptariama kompiuterinių technologijų, nanotechnologijų įtaka gyventi palankios aplinkos kūrimui. Akcentuojamas intelektinis aplinką tausojantis būstas, jo įgyvendinimo būdai ir priemonės. Apibendrinami atlikti moksliniai tyrinėjimai intelektinio būsto kūrimo srityje, nagrinėjami gyventi palankios aplinkos analizės modeliai. Antrajame skyriuje nagrinėjama integruotos intelektinės gyventi palankios aplinkos būsto modelio koncepcija. Pateikiamas ir detaliai analizuojamas integ-ruoto intelektinės gyventi palankios aplinkos būsto modelis, nagrinėjami modelį sudarantys elementai, mikro- ir makroaplinka, jos įtaka, paklausos ir pasiūlos charakteristikos, praktinės modelio realizavimo galimybės. Trečiajame skyriuje analizuojamas intelektinės gyvenamosios aplinkos variantinis projektavimas ir daugiakriterinė analizė. Apibendrinamas daugiakriterinei analizei reikalingų pradinių duomenų paruošimo procesas. Aprašomas auto-rės pasiūlytas intelektinės gyvenamosios aplinkos variantinio projektavimo ir daugiakriterinės analizės modelis, analizės atlikimo eiliškumas, pateikiamos skaičiuoti reikalingos formulės. Atliekamas praktinių uždavinių sprendimas naudojant pasiūlytą modelį. Ketvirtajame skyriuje aprašoma pagal autorės pasiūlytą modelį sukurta... [toliau žr. visą tekstą] / The aim of the thesis is the evaluation and enhancement of the effectiveness of Intelligent Assisted Built Residential Environment through the application of the established Model of Intelligent Assisted Built Residential Environment (IABRE). This model is used to establish the Multi-criteria Decision Support System of Intelligent Assisted Built Residential Environment (MDSSIABRE), in which multi-criteria analysis and multi-criteria alternative design methods are used. In order to reach this aim, the following tasks must be solved: • Established models and intelligent systems are analysed in various countries. The experience of Lithuania and foreign countries is analysed in the establishment of ambient assisted living environment through the application of modern internet, intelligent and other technologies and innovations; • A Model of Intelligent Assisted Built Residential Environment is estab-lished (MIABRE); • The system of criteria is established, which describes IABRE in detail; • Data base is established, which describes IABRE in detail; • MDSSIABRE system is established on the basis of the Model of Intelli-gent Assisted Built Residential Environment; • Practical realisation of the established IABRE system is performed. The thesis is divided into four chapters including the conclusion’s chapter. Chapter 1 analyses assisted residential environment, reviews the research on life quality and conditions in Lithuanian and abroad. It analyses the premises and the... [to full text]