推动北京成为国际债券中心的思考

本文通过对北京建设国际债券中心的必要性、可行性以及面临的挑战进行深入的分析,得出北京建设国际债券中心的政策建议。

论我国金融配置效率的改进与企业债券市场的发展

本文利用金融学基础理论—市场完全性原理对我国金融体系资源配置低效率进行剖析,认为其根源在于市场的极度不完全,有限的金融工具对应日益扩大的风险空间,风险与收益严重不对称,金融风险不断积聚。因此应发展能够通过风险与收益的匹配进行资源有效配置的资本工具特别是企业债券,以降低我国经济运行中的潜在金融风险。针对我国区域经济不平衡的现实,可考虑通过建立区域债券交易中心来推动我国企业债券市场的发展。

Unanticipated Bond Failure over Supporting Band Beams in Grouted Post-Tensioned Slab Tendons with Little or No Initial Prestress

After grouting the ducts in a large band beam and one-way slab post-tensioned floor system in a large shopping mall （in excess of 1.5 km2 in plan）, doubts arose concerning the level of initial prestress and the strength and serviceability of the slabs was questioned. To assess the strength of the slabs, it was assumed, as a worst case scenario, that some spans may have been constructed with zero initial prestress. Load tests on prototype specimens, with similar dimensions and reinforcement quantities as the floor slabs, were performed to assess the stress development in initially unstressed, but fully grouted, tendons. Unexpected bond failures occurred at the junctions of slab and band beam where the abrupt change in section depth caused a sudden change in tendon stress. The maximum stress that was developed in the initially unstressed tendons at these locations was about 60% of the strength of the tendons.